1 /*****************************************************************************
2 * output.c : internal management of output streams for the audio output
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: output.c,v 1.3 2002/08/11 22:36:35 massiot Exp $
7 * Authors: Christophe Massiot <massiot@via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
27 #include <stdlib.h> /* calloc(), malloc(), free() */
32 #include "audio_output.h"
33 #include "aout_internal.h"
35 /*****************************************************************************
36 * aout_OutputNew : allocate a new output and rework the filter pipeline
37 *****************************************************************************/
38 int aout_OutputNew( aout_instance_t * p_aout,
39 audio_sample_format_t * p_format )
41 char * psz_name = config_GetPsz( p_aout, "aout" );
42 int i_rate = config_GetInt( p_aout, "aout-rate" );
43 int i_channels = config_GetInt( p_aout, "aout-channels" );
46 vlc_mutex_init( p_aout, &p_aout->output.fifo.lock );
47 p_aout->output.fifo.p_first = NULL;
48 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
49 p_aout->output.last_date = 0;
51 p_aout->output.p_module = module_Need( p_aout, "audio output",
53 if ( psz_name != NULL ) free( psz_name );
54 if ( p_aout->output.p_module == NULL )
56 msg_Err( p_aout, "no suitable aout module" );
60 /* Retrieve user defaults. */
61 memcpy( &p_aout->output.output, p_format, sizeof(audio_sample_format_t) );
62 if ( i_rate != -1 ) p_aout->output.output.i_rate = i_rate;
63 if ( i_channels != -1 ) p_aout->output.output.i_channels = i_channels;
64 if ( AOUT_FMT_IS_SPDIF(&p_aout->output.output) )
66 p_aout->output.output.i_format = AOUT_FMT_SPDIF;
70 /* Non-S/PDIF mixer only deals with float32 or fixed32. */
71 p_aout->output.output.i_format
72 = (p_aout->p_vlc->i_cpu & CPU_CAPABILITY_FPU) ?
73 AOUT_FMT_FLOAT32 : AOUT_FMT_FIXED32;
76 /* Find the best output format. */
77 if ( p_aout->output.pf_setformat( p_aout ) != 0 )
79 msg_Err( p_aout, "couldn't set an output format" );
80 module_Unneed( p_aout, p_aout->output.p_module );
84 msg_Dbg( p_aout, "output format=%d rate=%d channels=%d",
85 p_aout->output.output.i_format, p_aout->output.output.i_rate,
86 p_aout->output.output.i_channels );
88 /* Calculate the resulting mixer output format. */
89 p_aout->mixer.output.i_channels = p_aout->output.output.i_channels;
90 p_aout->mixer.output.i_rate = p_aout->output.output.i_rate;
91 if ( AOUT_FMT_IS_SPDIF(&p_aout->output.output) )
93 p_aout->mixer.output.i_format = AOUT_FMT_SPDIF;
97 /* Non-S/PDIF mixer only deals with float32 or fixed32. */
98 p_aout->mixer.output.i_format
99 = (p_aout->p_vlc->i_cpu & CPU_CAPABILITY_FPU) ?
100 AOUT_FMT_FLOAT32 : AOUT_FMT_FIXED32;
103 /* Calculate the resulting mixer input format. */
104 p_aout->mixer.input.i_channels = -1; /* unchanged */
105 p_aout->mixer.input.i_rate = p_aout->mixer.output.i_rate;
106 p_aout->mixer.input.i_format = p_aout->mixer.output.i_format;
108 /* Create filters. */
109 if ( aout_FiltersCreatePipeline( p_aout, p_aout->output.pp_filters,
110 &p_aout->output.i_nb_filters,
111 &p_aout->mixer.output,
112 &p_aout->output.output ) < 0 )
114 msg_Err( p_aout, "couldn't set an output pipeline" );
115 module_Unneed( p_aout, p_aout->output.p_module );
119 /* Prepare hints for the buffer allocator. */
120 p_aout->mixer.output_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
121 p_aout->mixer.output_alloc.i_bytes_per_sec
122 = aout_FormatToByterate( &p_aout->output.output,
123 p_aout->output.output.i_rate );
125 aout_FiltersHintBuffers( p_aout, p_aout->output.pp_filters,
126 p_aout->output.i_nb_filters,
127 &p_aout->mixer.output_alloc );
132 /*****************************************************************************
133 * aout_OutputDelete : delete the output
134 *****************************************************************************/
135 void aout_OutputDelete( aout_instance_t * p_aout )
137 module_Unneed( p_aout, p_aout->output.p_module );
139 aout_FiltersDestroyPipeline( p_aout, p_aout->output.pp_filters,
140 p_aout->output.i_nb_filters );
141 aout_FifoDestroy( p_aout, &p_aout->output.fifo );
144 /*****************************************************************************
145 * aout_OutputPlay : play a buffer
146 *****************************************************************************/
147 void aout_OutputPlay( aout_instance_t * p_aout, aout_buffer_t * p_buffer )
149 aout_FiltersPlay( p_aout, p_aout->output.pp_filters,
150 p_aout->output.i_nb_filters,
153 p_aout->output.pf_play( p_aout, p_buffer );
156 /*****************************************************************************
157 * aout_OutputNextBuffer : give the audio output plug-in the right buffer
158 *****************************************************************************/
159 aout_buffer_t * aout_OutputNextBuffer( aout_instance_t * p_aout,
162 aout_buffer_t * p_buffer;
164 vlc_mutex_lock( &p_aout->output.fifo.lock );
165 p_buffer = p_aout->output.fifo.p_first;
167 while ( p_buffer != NULL && p_buffer->end_date < start_date )
169 msg_Dbg( p_aout, "audio output is too slow (%lld)",
170 start_date - p_buffer->end_date );
171 p_buffer = p_buffer->p_next;
174 p_aout->output.fifo.p_first = p_buffer;
175 if ( p_buffer == NULL )
177 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
178 vlc_mutex_unlock( &p_aout->output.fifo.lock );
179 msg_Dbg( p_aout, "audio output is starving" );
183 if ( p_buffer->start_date > start_date
184 + (mtime_t)p_aout->output.i_nb_samples
185 * 1000000 / p_aout->output.output.i_rate )
187 vlc_mutex_unlock( &p_aout->output.fifo.lock );
188 msg_Dbg( p_aout, "audio output is starving (%lld)",
189 p_buffer->start_date - start_date );
193 /* FIXME : there we should handle the case where start_date is not
194 * completely equal to p_buffer->start_date. */
196 p_aout->output.fifo.p_first = p_buffer->p_next;
197 if ( p_buffer->p_next == NULL )
199 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
202 vlc_mutex_unlock( &p_aout->output.fifo.lock );